They recently added support for dragonboard, and I would like to write a blog post about that. But, build.snapcraft.io is not yet building snaps for arm64. @cjwatson@evan do you know if that’s going to happen any time soon?

Here's the proposal from when base snaps weren't a thing: https://lists.ubuntu.com/archives/snappy-app-devel/2016-April/000654.html
On that proposal we basically explored a key to hint builders for what architecture to build on, it had the form of:
target-architectures: [arch1, arch2, arch3]
Where archX could be any architecture tag as used on snaps today such as amd64 or arm64.
Given base snaps and to be future proof we probably want to extend that to something like:
build-on:
ub…